Snoop: saves gnuplot plot files along with PDFs

Jun Furuserequested to merge
dailambda/tezos:jun@plot-save into master

This MR fixes #5733 (closed):

  • Benchmark: refactors Plot
    • It has many API functions almost similar but with slight differences.
    • This MR unifies them down to 2.
  • Snoop: Display.perform_plot now saves Gnuplot .plot files
    • Now it keeps Gnuplot .plot files. For example:
$ ./octez-snoop generate code for benchmarks interpreter/N_IOpen_chest --out-dir dir --plot
$ ls dir/*plot
dir/N_IHalt_interpreter_emp-validation.plot
dir/N_IOpen_chest_interpreter_validation.plot
dir/TIMER_LATENCY_interpreter_emp-validation.plot
dir/amplification_loop_interpreter_emp-validation.plot
dir/amplification_loop_interpreter_validation.plot
dir/intercept_interpreter_emp-validation.plot

Using these *.plot files we can visualize the plots:

$ gnuplot dir/N_IOpen_chest_interpreter_validation.plot

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